scifi story (as you could probably guess) where a brutally overpowered guy from outer space has to save humans from evil invading aliens, and then offers his stuff to humans thus making spaceflight way better and allowing humanity to spread into space, peacefully colonizing planets and later making alliances with non-aggressive aliens, eventually they go to a nearby galaxy and discover there's many planets there that can support lofe but many planets are also uncannily familiar so the whole experience is strange
after that, the overpowered guy tries to train another guy to be as good as him but the other guy turns evil and tries to kill him and humanity but ultimately fails and is then converted back to normal and then they search for a third overpowered guy on a snowy planet, they do a bit more overpowered guy things but then the first guy gets severe PTSD from his cringe memories (#relatable) and has to fly out of the universe to 1v1 a god who trapped the universe in a simulation
and in the end he wins because of plot armor and multiple backup plans but the god actually manifested itself into an absolute unit of a monster which plans to completely explode earth, so the overpowered guy uses all of his boost power and slams that bad boy into the sun, burning the monster's skin and exposing the god to 6000+ degrees of sun and thus finally getting the victory royale, and afterwards everyone is safe but overpowered guy gets heavy damage so has to go to repair himself with the help of the other two overpowered guys but ofc he survives cause y'know he's the main character (this is just part 1)
that's basically the simplest way i can sum it up lmao
it's a bit too extreme but it is actually slightly realistic compared to other scifi stuff i've seen or read